399388883993 has 4 divisors (see below), whose sum is σ = 435696964368. Its totient is φ = 363080803620.

The previous prime is 399388883941. The next prime is 399388884061.

399388883993 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 399388883993 - 2⁸ = 399388883737 is a prime.

It is a super-2 number, since 2×399388883993² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (399388883093) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18154040171 + ... + 18154040192.

It is an arithmetic number, because the mean of its divisors is an integer number (108924241092).

Almost surely, 2^399388883993 is an apocalyptic number.

It is an amenable number.

399388883993 is a deficient number, since it is larger than the sum of its proper divisors (36308080375).

399388883993 is a wasteful number, since it uses less digits than its factorization.

399388883993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36308080374.

The product of its digits is 2176782336, while the sum is 80.

The spelling of 399388883993 in words is "three hundred ninety-nine billion, three hundred eighty-eight million, eight hundred eighty-three thousand, nine hundred ninety-three".